配電箱的防護等級是根據(jù)國際電工委員會（IEC）的標準劃分的，主要指的是配電箱外殼對外界物體、水和灰塵的防護能力。

The protection level of the distribution box is divided according to the standards of the International Electrotechnical Commission (IEC), mainly referring to the protective ability of the distribution box shell against external objects, water, and dust.

　　具體的防護等級分為 IP20、IP30、IP40、IP54、IP65 等。其中，IP 中的第一個數(shù)字表示防塵等級，第二個數(shù)字表示防水等級，數(shù)字越大表示其防護等級越佳。具體如下：

The specific protection level is divided into IP20 IP30, IP40, IP54, IP65, etc. Among them, The first number in the IP represents the dust level, the second number represents the waterproof level, and the larger the number, the better its protection level. Specifically, as follows:

　　1. IP20：只能防護直徑大于12.5毫米的物體進入，不能防護水和灰塵的侵入，適用于干燥、無塵、無腐蝕氣體的室內(nèi)環(huán)境。

1. IP20: It can only protect objects with a diameter greater than 12.5 millimeters from entering, and cannot prevent the intrusion of water and dust. It is suitable for dry, dust-free, and corrosion-free indoor environments.

　　2. IP30：能夠防護直徑大于2.5毫米的物體進入，不能防護水和灰塵的侵入，適用于一般的室內(nèi)環(huán)境。

2. IP30: It can prevent objects with a diameter greater than 2.5 millimeters from entering and cannot prevent the intrusion of water and dust. It is suitable for general indoor environments.

　　3. IP40：能夠防護直徑大于1毫米的物體進入，不能防護水的侵入，適用于一般的室內(nèi)環(huán)境。

3. IP40: It can prevent objects with a diameter greater than 1 millimeter from entering and cannot prevent water intrusion. It is suitable for general indoor environments.

　　需要注意的是，防護等級是可以按照需求進行組合的，比如IP46。不過常見的高壓配電柜常用的防護等級是IP40，低壓配電柜常用的防護等級是IP30。

It should be noted that the protection level can be combined according to requirements, such as IP46. However, the commonly used protection level for high-voltage distribution cabinets is IP40, while the commonly used protection level for low-voltage distribution cabinets is IP30.

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